Drop hammer



Feb. 28,1933. R EJWALDRQN 1,899,371

DROP HAMMER Filed May 25, 1931 2 Sheets-Sheet l W v R Kass efilif adafrwz BY WW, 4,05%

ATTORNEYS Feb. 28, 1933. 7 RE. WALDRON DROP HAMMER 2 Sheets-Sheet 2 Filed May 25, 1951 ATTORNEYS nnssnLL .ni. w Lnnon;

Patented; Feb 28;} l

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" 1 cl ppl i cation fi led- Lies;

, 'i Y Q The invention. relates drop hannners I of that type in whi' h'thehammer block is lifted a V by the frictional engagement of: driven rollj ment being the falling of the same j-an'd" the delivery of a the. hammer below. f It,

ers with aboard shank; the-frictional engage? released at a predetermined'point in the upwa d travel of the blockto' permit is the" object of the present invention to obtain a, construction with which the height of; the lift and fconsea quently the force-,of the blow maybe varied andwithout the necessity of'stoppi'ng thema j chine this n 'e t ll consists 7 to, have longzbeen used in 7' rods-I and Ii which ward at one; side of etheffralneyand; from, 10

justin'g n ts g raised or lowered? -The thereof constructi on;

. spacedupright frames for adjusting thesame ito movetheir eral facestowardsor I? is provid d t itslower end witha 7 ed in the novel construction as :hereinafter set forth.

InSthe drawin 7 r Figure. 51 isajsfront, iny p I V the shankF. A- p1n N pncthle hammer block engagesthe lever N to rockthe same'upward:

proved machine; I 1 =1 Figure 3 2 I 11s; a sect onal, s de {elevation Figure 3 is a diagram 2a Drop hammersjof 'the typ'e above a the art" and ingeneral construction comprises a bed .or anvil A,-

.C atthe upper endfof these frames friction rolls D and D mounted ;on' this cross head, a hammer block Eand 'a board shank Fiisecured at, its lower end to said hammer block vjt-ion whe'nj, the :rnachin'e is not in 1 operation,

there, is provided a locking nechanism coma f V a v the cross head 'O'and arranged D. The rolls D and-D"iareajournaledain eccentric bearings G and ';'which are pro vided-' with actuating ;:r0 ck armsv1 H- and periph f thl ard F-yflTh: have conne ted thereto extend verticallysdowne rock arms H and H weightsfor rocking the v3 711 H downward to produce'the desired frictionbetween' the rolls D and 'D-=afnd shankF; Onejofthe rods 1 h ee ortion passing;through-Yam apertured brac et J on the? frameBT and having ad-, J '9' thereon "by which "it may be other rod 'I extends] '7 through a bearing K having a} shank Kf= lat+ erally .slidablyimounted on the" frame and, resiliently drawn -inwardflby the tension of- ;a

therock arm.

s rin j l hasgadjustably clamped )thereto a collar which in certain p ositi'ons of the rod is adapt; ed i to engage with the rollerbearing sh 116M on the frameBsQJthe reby holding the rod in, 'raisedpositionzand through the mediumof I H anec centric G withdrawing the, roller 1D 'frvonizfrictional contact with the board shankRi -When, however,'thecollar-L I i isfdisengaged from the: shelf the rod I ;movesidown'ward and'its, weight issufiicient to product the desired friction between the rolleri D. and vthe shank F. For raising the "rodrto engage the collar fromthe shelf. M L the-re isprovided, a'lever N, pivoted; at N on the; frame B:- nd. extending adj ace'nt; to the ath; of the ohaminerbhlock Elwhen-li fted; by

There is alsoaicollar O clamped upon the .rod I andengaging the lever Nso that :the rock-o the :collar L- tdengag'elthe roller; shelfFM', For' disengaging the collar L from the Mganaia rm :1 clamped to the" rod extends adj-1' lower: end offits trwavel'and a cam, block engaging; the arm'P'will move said: arm n he' d the tensionf thespring K thereby disen-- a iIig,the'collarijLfrom theishelf ,prisingfi'rockahle friction dogs Q 'jandfiQf lm sd uponfgoppos'ite,sides-oftheboard shank F;

7 These dogs ;are adapted whenever released to'clampthe shankiF and to hold the sameand' the hammer block E suspended thereon from; downward movement.

I and bearingKout-ward against a V r -80 7 Above the; bearing i ingoftheflatterwillliftjtherodIpermitting:

shelf v v '75" B nd B6, ac o head jacent togthe path of ;the. block Enear'. the

'0n:this

The dogs may, how:

ever, be released by the operationofa treadle 1i 'Rwhich is connected throughtheinedium of;

. theta-whenever the .treadlei is depressed j the {hammer block to sfall;

follows:.ThelrollersD and D l are driven V dogs: willrehaasetheshank F permitting the V 7 he constr ction: as lthus tar described-is i S releases the dogs the shank, permitting the; hammer block to pulleys T and To'r any other suitable drive connection so as to revolve in opposite directions with portions of their peripheriesadjacent to or contacting with the board F, travcling in an upward direction. The normal position of the red I is with the collar L resting on the roller shelf M and the normal'position of the dogs Q andQ, islin engagement with the shank F when; thehammer block E is in raised position; Tofstart the machine and deliver a. blow the treadle It is depressed whichthrough the medium of rodsS and Q, and Q andla's the rollers D and D are not infrictional engage ment with the shank the block B will drop, delivering the blow upon the work supported by the bed oranvil A. During the descent of the block Ethe cam'E" thereon engaging the arm P will 'move'the engaging'theico'llar L from the shelf M and permitting the rod to fall. This will'move' the roller. D into frictional engagement with the shank F and as bothrollers D and D are constantly rotating,the shank 'will be" driven upward, lifting therewiththe hammer block E. WVhen, however, the pin N 2 engages the I lever N, this lever willbe rocked and through its engagement withthe collar 0 will lift the rod 1, whereupon the spring K drawing" the bearing K inward willengage the col-. lar L'with the shelf M. This again releases drop and this operation will be repeated as long as the treadle R is held depressed. However, it the treadle is releasedthe dogs Q and Q willbe permitted to engage't'heshank E to'hold the same in raised position. l

To adapt the machine for difi'erent variations of work provision is madefor adjusting the leverN and collar 0 so that the hammer block may be released from this elevation above the anvil. This'will correspondinglychange the force of the blow delivered but tomake such anadjustment it is necessary to stop the machine. Moreover, considerable time is requiredin eflecting the adjustment during which the machine re-I mains idle. lVith certain constructions man; u'ally operable means has been provided for lifting the rod I to release the frictionioll D, but on account of the weight of the parts" andthe consequent-large inertial factor, it isdifiicult or impossible'for the operator to make use of this means to vary-the force of the blow duringoperation of the machine. It

is therefore the primary object of my inven- 'tion to provide means for varying the stroke of the hammerwhichrequires no labor on the part ofthe operator. It is a further ob-, ject to accomplish this result in such a mannor that the operator may control the' machine during its operation so tliat suc cessive blowsmay either light or'hea vy, according to the requirements of thework;

y improvement consists essentiallyin a releasing the dogs Q and Q. CII'CIIItalSO includes a switch or circuit closer V same outward, (118: ;W

the switches W, W

1 able in a bearing X powermotor for lifting the rod I, which is specific constructions may be used for accomplishing the desired result but as shown, I

employ a pneumatic motor comprising a cyl- "inder U and piston U mounted on the bed A or otherwise secured to be arranged beneath the rod I. The movemento'f the piston within the cylinder is controlled bya valve V which in turn is operated by a solenoid W.

This solenoid is arranged in an electric circuit which includes a switch'or circuit closer W arranged to be actuated by the treadle R when depressed further than necessary for The electric hammer block E during 1ts upward movement. Thus the electric circuit is closediand thesolenoid Wenergized only when both of 2 Which-is mechanically actuated by the being under the control of the operator and the latter being automatically actuated. The L switch 'W as shown in Figure l.is mounted upon a plate X which in turn is vertically a-djustablymounted on the frame B. The switch is actuated by a rod X laterally slid 0n the plate and having which extends into the path of a a roller Ii cam 'X on the block E. Thus theupward movement of the block E will cause the cam X contacting with the roller X to move the rod X, thereby closing the switch W and if the treadle R has been previously depressed to a position where it will close the switch W, the solenoid W will be energized, operatingthe valve V to admit compressed air into thecylinder U. This byraising the pistonfU will lift the rod I permitting the collar L toengagewith the roller shelf M. Consequently the hammer-block insteadof being lifted to i V the 'point where the switch l/V is located, this beingvaried by adjustment of the plate Xon the frame" B. In the for perfo practical operation of the hammer mingmost work, it is not necessary to have more than the two strengths of blow, the one delivered by the raising of the ham mer blockinto engagement with the lever N r o and the other by; releasing the block upon the closing of the switch W If, however,it is desiredto have more than these two strengths,

this may be accomplished by arranging a series of switches W W W and actuating means therefor located. at different elevations above theanvil. The particular one of these switches jtobe usedmay be controlled by-a selective switch Ywhich is under the con trolof the operator, asshown in Figure 3. With this modification the operator still controlsrthe operation by the treadle R but by are closed, the former its full height will drop from adjusting the selective switch iYmayflchange I ments are mounted on themain framebut'at the strength of the lighter blow as desired.

One of the advantagesof'my construction is that it requires no'modification of the standard construction of hammer'whichgnormally functions in the same way as ,hereto-' fore. The, added jelements are entirelyi distinct from those of the standard construe-1 tion and if desired maybe mountedon a separate frame. However, as shown, these elepoints where they. do not interfere with any of the working parts of the standard machine.

To avoid anyinterference to the dropping; i of the rod dueto lag in the operation of the pneumatic motor, I preferablyprovideuauxiliary means forinstantaneously' de-ener Zing the solenoid W and shifting the Valve uponf' v engagement of the collar Lcwithfthe roller M. This 'cOmpr ses a circuit loreaker- Y which is in series with the switche'slWf, W and which is mechanically actuatedby the rod I'whenthe lattera is,engagedior'disengaged from the shelf The arrangement is such that the circuit is closedwhen the rod I is down or disengaged from'thej shelf, but

is open when the rod'is supported by engagement of the collar L'with the roller M. v Thus as soon as the rod Iis raised by the piston U so that the collar L engages the rollerM',f-fthe i v solenoid W' willvbe de energizedf which by i a shifting the valVeV will drop thefpiston U, permitting therod I to fall freely {when w leased bythe :arm P.

What I claimas'my lnventionis :1;

In a drop hammer of the type comprising friction means for lifting the hammer block and a control rod andcooperating'means for automatically eifectingthe engagement and release of said friction means for a'pred'etera mined length of stroke of the, hammen'of an auxiliary pneumatic motorfor liftingg said rod, electro-magnetic means, controlling the, r

operation of said motor; a circuitjcloser for the circuit ofsaid eleetro-magnetic Imeans a t operated at a predetermined point in the upward movement of the hammer blockiless: than its. full stroke wherebyfsaid motor will lift said rod, andacircuitbreaker also controlling said circuit fender-energizing said I electro-magnetic means at the completion of In testimony whereof signature I the raising of said rod.

RUSSELL ZE; WALDRON. 

